| Hostiaz | |
| Arrondissement: | Belley |
| Canton: | Plateau d'Hauteville |
| Commune: | Plateau d'Hauteville |
| Insee: | 01186 |
| Postal Code: | 01110 |
| Coordinates: | 45.9017°N 5.5344°W |
| Elevation M: | 750 |
| Elevation Min M: | 680 |
| Elevation Max M: | 1086 |
| Area Km2: | 10.6 |
| Population: | 92 |
| Population Date: | 2021 |
| Population Footnotes: | [1] |
Hostiaz (pronounced as /fr/; formerly Hostias[2]) is a former commune in the Ain department in eastern France. On 1 January 2019, it was merged into the new commune of Plateau d'Hauteville.[3]